Air-Filled Buffer Vehicle Restraint for Chassis Dynamometer Resonance Control
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Solution Overview
Problem
Conventional vehicle restraining devices using cord-like members fail to accurately reproduce vehicle behavioral frequencies close to those on a road due to mechanical resonance characteristics that interfere with vehicle movement vibrations.
Innovation Solution
A vehicle restraining device with adjustable support post units, air-filled buffer units, and air pressure control systems that measure and adjust restraining forces to match on-road resonance frequencies, incorporating vibration damping devices to prevent interference with vehicle behavioral frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cord-like members are used to restrain the vehicle, then the vehicle can be securely restrained on the test device, but the mechanical resonance characteristic interferes with vehicle movement vibrations and prevents accurate reproduction of on-road behavioral frequencies
Solution Approach 1:
The patent replaces cord-like members with air-filled buffer units that use pneumatic pressure to provide restraint forces. The air pressure in the buffer units can be controlled to match on-road restraint conditions, eliminating mechanical resonance interference while maintaining reliable vehicle restraint during testing
Solution Approach 2:
The patent changes the physical state of the restraint system from solid (cord-like members) to gas (air-filled buffer units). This parameter change allows the restraint system to comply with vehicle movement vibrations and accurately reproduce on-road behavioral frequencies without mechanical resonance interference
2Stability of the object's composition
If rigid restraining structures are used, then the vehicle is firmly held in position, but the resonance frequency of the restraining device interferes with the behavioral frequency of chip-in shock
Solution Approach 1:
The patent uses air-filled buffer units instead of rigid restraining structures. The pneumatic system provides firm vehicle positioning while the compressible nature of air eliminates resonance frequency interference with chip-in shock behavioral frequencies
Solution Approach 2:
The air-filled buffer units act as an intermediary between the rigid support posts and the vehicle. This intermediate pneumatic element transmits restraint forces while isolating the vehicle from resonance frequency interference caused by rigid structures
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reproduces vehicle behavioral frequencies close to those on a road, enhancing the accuracy of vehicle tests by deviating the mechanical resonance characteristic from the vibration characteristic, thus improving reproducibility and allowing for precise force measurement and evaluation.
Implementation Method 1
a buffer unit which is provided between the first attachment member and the second attachment member and which is filled with air and can be compressed freely
Implementation Method 2
the resonance frequency of the vehicle restraining device is avoided from interfering with the behavioral frequency of the chip-in shock
Data Source
AI summary
An object of the present invention is to reproduce vehicle behavioral frequencies during a vehicle test that are close to those on a road. Vehicle restraining devices 1 restrain a vehicle 3 provided on a chassis dynamometer 2 and are each provided with a first attachment member 4, a support post unit 5, a second attachment member 6 and a buffer unit 7. The first attachment members 4 are attached to right and left front end portions and rear end portions of the vehicle 3. The second attachment members 6 are attached to the support post units 5. The buffer units 7 are provided between the first attachment members 4 and the second attachment members 6. Further, the buffer units 7 are filled with air and can be compressed freely.